【单选题】【消耗次数：1】
表示扭转变形程度的量( )。
①
是扭转角ψ，不是单位长度扭转角θ
②
是单位长度扭转角θ，不是扭转角ψ
③
是扭转角ψ和单位长度扭转角θ
④
不是扭转角ψ和单位长度扭转角θ
参考答案：
复制
纠错
相关题目
【单选题】
一圆轴用碳钢制作，校核其扭转刚度时，发现单位长度扭转角超过了许用值为保证此轴的扭转刚度，采用哪种措施最有效( )。
①
改用合金钢材料
②
增加表面光洁度
③
增加轴的直径
④
减小轴的长度
【单选题】
关于八字扭转拔牙法，以下说法正确的是
①
初始扭转角度可以大一点
②
八字扭转拔牙法只适用于下颌智齿的拔除
③
扭转到位后最好停顿3-5秒
④
八字扭转拔牙法用到的力学原理是摇动
⑤
八字扭转法比摇动法更容易导致牙根折断
随机题目
【单选题】
13.The children have left. It’s getting _______ now.
①
quiet
②
quieter
③
more quiet
④
. calmer
【单选题】
7.He______ her on her new dress without looking at it.
①
praised
②
B. enjoyed
③
complimented
④
cared
【单选题】
25.I prefer this chair to the other one. It’s ___________ .
①
comfortable
②
more comfortable
【单选题】
21.Children used to be quiet. Nowadays they seem to be much ____________.
①
more noisy
②
noisy
【单选题】
30. I prefer __________ to ___________.
①
to drive; be driven
②
to drive; rather than being driven
③
driving; being driven
④
being driven; drive
【单选题】
15.Let me know if you hear any _____ news.
①
farther
②
further
③
far
④
. the further
【单选题】
20. He has received many presents from admirers, from the_____ to the valueless..
①
precious
②
expensive
③
priceless
④
cheap
【单选题】
8.We have very much ______ your prompt attention to our request.
①
enjoyed
②
appreciated
③
liked
④
. reduced
【单选题】
17.Her_____ body language spoke much louder than her actual words.
①
graceful
②
. grateful
③
gracious
④
grand
【单选题】
16.Tom and Jerry both gave good reports, but Tom’s was_____.
①
best
②
the best
③
better
④
the better